JPH08326656A - Compressor - Google Patents

Abstract

PURPOSE: To enhance the reliability of a compressor even though a retainer is formed integrally with a housing having a discharge chamber by eliminating occurrence of the torsion and vibration of a reed valve. CONSTITUTION: In the inside of a discharge chamber 36 partitioned and formed in a rear housing 13, a plurality of retainers 39 is radially integrally projected from the center of the rear housing 13 toward a position opposed to a discharge valve 38. Each Groove 40 is formed to each retainer 39 in such a way that it is extended in the radial direction of the rear housing 13, and the discharge valve 38 in its closing condition is supported by two ridge lines 42.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used in a vehicle air conditioner, for example.

[0002]

2. Description of the Related Art In a compressor of this kind, when a refrigerant gas reaches a predetermined pressure during a compression stroke in a compression chamber, it pushes a reed valve away and is instantaneously discharged into a discharge chamber. At this time, if the reed valve is excessively deformed, the reed valve may be deformed and may not return to its original shape or may be damaged. In order to prevent the plastic deformation and damage of the reed valve, generally, a compressor is provided with a retainer for restricting the opening of the reed valve. For example,
Japanese Patent Laid-Open No. 1-134085 discloses a compressor in which a retainer is integrally formed with a rear housing having a discharge chamber.

[0003]

SUMMARY OF THE INVENTION Here, the retainer is
The number of reed valves for discharge, that is, the same as the number of cylinders is required. In the compressor disclosed in the above publication, the surfaces of the plurality of retainers are machined at the same time when the housing is machined by lathe machining or the like, and the surfaces of the retainers are curved surfaces forming a part of the conical surface. On the other hand, the reed valve is formed of a leaf spring and has a flat shape. Therefore, when the reed valve is opened and brought into contact with the surface of the curved retainer,
The reed valve and the retainer come into contact with each other on one ridgeline. Therefore, the position of the reed valve is not stable on the retainer, and the reed valve may be twisted with respect to its fixed portion,
There is a problem in that it is easy to vibrate in small steps and may be damaged.

In order to prevent this, it is conceivable to machine the surface of the retainer into a flat shape, but in this case, it is necessary to cut each retainer one by one. Therefore, not only is it time-consuming and costly, but the reed valve adheres to the retainer due to surface tension,
There are problems that the opening / closing timing of the discharge valve is incorrect, or the contact area between the two becomes large and a loud collision noise that causes noise is generated.

An object of the present invention is to provide a highly reliable compressor in which the reed valve is not twisted or vibrated even when the retainer is integrally formed with the housing having the discharge chamber.

[0006]

In order to achieve the above object, according to the invention of claim 1, two parallel ridge lines extending in a substantially radial direction of the housing are formed in the retainer, and the reed valve and the ridge line are formed. The opening is regulated by the contact of the.

According to the invention of claim 2, in claim 1,
A groove extending in the radial direction of the housing is formed on the surface of the retainer, and ridge lines are formed on both side edges of the groove. According to a third aspect of the invention, in the second aspect, at least one end of the groove is open.

According to the invention of claim 4, in claim 2,
Both ends of the groove are closed.

[0009]

According to the invention of claim 1, when the reed valve is opened, the reed valve is supported by the two ridge lines and twisted,
It is supported stably without vibrating. Further, the surface of the retainer surface that does not come into contact with the reed valve may be formed of, for example, a part of a conical surface, and the surfaces of a plurality of retainers can be simultaneously processed by a lathe or the like.

According to the invention of claim 2, the two ridge lines can be formed by, for example, a groove formed at the time of die casting of the housing. According to the invention of claim 3,
When the reed valve is opened, the refrigerant gas can flow between the reed valve and the groove of the retainer. For this reason,
Good valve separation from the retainer, and reduction in compression effect due to delay in closing the reed valve is prevented.

According to the invention of claim 4, the lubricating oil entrained in the refrigerant gas is stored in the groove. Then, the lubricating oil absorbs the impact due to the collision between the reed valve and the retainer when the reed valve is opened. Therefore, collision noise and vibration between the reed valve and the retainer are prevented.

[0012]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIG.
~ It demonstrates based on FIG.

As shown in FIG. 1, the cylinder block 11
Constitutes a part of the housing of the entire compressor, and the front housing 12 is joined to the front end surface thereof,
A rear housing 13 is joined to the rear end surface via a valve plate 14 and a pair of valve forming plates 15 and 16. The drive shaft 17 is supported by the cylinder block 11 and the front housing 12 via a pair of radial bearings 18 and 19 and thrust bearings 20 and 21, and a lip seal 2 is provided between a front end of the drive shaft 17 and the front housing 12.
2 is installed.

A plurality of cylinder bores 23 forming a compression chamber
Are penetratingly formed in the cylinder block 11 so as to be parallel to each other, and a single-headed piston 24 is inserted therein. The crank chamber 25 is defined between the cylinder block 11 and the front housing 12. The swash plate 26 is tiltably fitted into the drive shaft 17, and is integrally rotated with the drive shaft 17 via the lug plate 27, the support arm 28, and the spherical coupling body 29. The rotation of the swash plate 26 is converted into reciprocating motion of each piston 24 within the cylinder bore 23 via the shoe 30.

Between the swash plate 26 and the lug plate 27,
A spring 31 is interposed so that the swash plate 26 is biased and held to the side of the minimum inclination angle when the compressor is stopped. In order to set the minimum tilt angle position of the swash plate 26, the drive shaft 1
A stopper 32 is attached to the top of 7. The suction chamber 33 is defined in the outer peripheral portion of the rear housing 13. The suction chamber 33 is connected to the cylinder bore 23 via a suction port 34 on the valve plate 14. The suction port 34 is
It is opened and closed by a suction valve 35 which is a reed valve on the valve forming plate 15. The discharge chamber 36 is defined in the center of the rear housing 13. The discharge chamber 36 is connected to the cylinder bore 23 via a discharge port 37 on the valve plate 14. The discharge port 37 is opened and closed by a discharge valve 38 which is a reed valve on the valve forming plate 16. Where the piston 24
In the suction stroke from the top dead center to the bottom dead center, the refrigerant gas in the suction chamber 33 pushes the suction valve 35 and is sucked into the cylinder bore 23. When the gas in the cylinder bore 23 is compressed to a predetermined pressure in the compression stroke in which the piston 24 moves from the bottom dead center to the top dead center, the compressed gas pushes the discharge valve 38 away and instantaneously discharges it into the discharge chamber 36. To be done. At this time, the discharge valve 38 is connected to the rear housing 1.
Retainer 3 for restricting the opening that is provided inside 3
The opening is regulated so as not to be excessively deformed by being brought into contact with 9.

The retainer 39, as shown in FIG.
It is provided so as to project radially from the center of the rear housing 13 toward the position facing the discharge valve 38 and integrally with the rear housing 13. A groove 40 is formed in each retainer 39 so as to extend in the radial direction of the rear housing 13, and is open at the tip. Surface 4 of retainer 39
As shown in FIG. 3, 1 is a curved surface having a downward slope from the center side toward the tip. Where the groove 40
A ridge 42 between the surface and the surface 41 has two portions extending radially of the housing.

According to the present embodiment configured as described above, when the compressed gas from the cylinder bore 23 is discharged into the discharge chamber 36, as shown by the phantom line in FIG. The retainer 39 integrally formed with the blade 13 is abutted so as to substantially follow the ridgeline 42. Therefore, the discharge valve 38 does not open excessively. Also,
As shown by the phantom line in FIG. 4, the discharge valve 38 has two ridge lines 42 formed in parallel on the surface 41 of the retainer 39.
Supported by parts. Therefore, the discharge valve 38 is stably supported without being twisted or vibrated when the valve is opened. Therefore, the discharge valve 38 can be made less likely to be damaged, and the reliability of the compressor can be improved.

Further, the surface 41 of the retainer 39 may be formed so that a ridge line 42 serving as a contact portion with the discharge valve 38 is substantially parallel so as to support the discharge valve 38 without twisting. The other parts may be formed of, for example, a part of the conical surface. Therefore, the plurality of retainers 39
There is no problem even if the surface 41 of
The retainer 39 can be easily processed, which is advantageous in manufacturing.

Further, the two ridge lines 42 are provided by forming a groove 40 on the surface 41 of the retainer 39.
Therefore, the groove 40 can be formed according to a mold in die casting of the rear housing 13, for example.
Easy to make.

[0020]

[Other Embodiments] Next, another embodiment of the present invention will be described focusing on parts different from the first embodiment. (Second Embodiment) As shown in FIG. 5, in the second embodiment, the plurality of grooves 51 are open at both ends and communicate with each other. Also in this second embodiment, two ridge lines 42 are formed in each retainer 39 in the radial direction of the housing.

According to this structure, the refrigerant gas can easily flow through the groove 51. Therefore, the discharge valve 38 is easily separated from the retainer 39, and the delay in closing the discharge valve 38 can be prevented. Therefore, it is possible to prevent the compressed gas from returning to the inside of the cylinder bore 23 in the intake stroke of the piston 24, and to prevent the compression effect from decreasing. (Third Embodiment) As shown in FIG. 6, in the third embodiment, both ends of the groove 56 are closed. Also in this third embodiment, two ridge lines 42 are provided in the radial direction of the housing.
Are formed on each retainer 39.

With this structure, the lubricating oil entrained in the refrigerant gas can be stored in the groove 56. And
The lubricating oil stored in the groove 56 absorbs the impact due to the collision between the discharge valve 38 and the ridgeline 42 of the retainer 39. Therefore, it is possible to prevent the generation of impact noise and vibration due to the collision between the discharge valve 38 and the retainer 39. (Fourth Embodiment) As shown in FIG. 7, in the fourth embodiment, the refrigerant gas introduction grooves 61 are provided on both sides of the center of the groove 56 on the retainer 39 in the third embodiment.

With this construction, as in the third embodiment, it is possible to reduce the generation of impact noise and vibration due to the collision between the discharge valve 38 and the retainer 39, and to let the refrigerant gas and the lubricating oil in and out of the groove 56 come in and out. Therefore, the discharge valve 38 can be easily separated from the retainer 39.

The present invention can also be implemented with the following modifications. (1) The number of retainers 39 should be different from the number described in the above embodiment in accordance with the number of discharge valves 38, that is, the number of cylinders.

(2) Form the groove 40 on the retainer 39 by cutting. (3) As shown in FIG. 8, the two ridge lines 42 should be shaped so as to be substantially parallel but not in an exact parallel state.

(4) The present invention is applied to a compressor of a type different from the above-mentioned embodiment, for example, a fixed capacity single-head piston compressor,
It should be embodied in a wobble type compressor, a double-headed piston compressor, a wave cam type compressor, a scroll type compressor, a vane type compressor having a flat discharge valve, etc.

[0027]

As described above in detail, the present invention has the following excellent effects. According to the first aspect of the present invention, twisting and vibration when the discharge valve is opened can be prevented, the discharge valve can be made less likely to be broken, and the reliability of the compressor can be improved. Further, the surfaces of the plurality of retainers can be simultaneously processed by using, for example, a lathe, which is advantageous in manufacturing cost.

According to the second aspect of the present invention, the contact portion of the discharge valve on the surface of the retainer can be formed at the time of die casting of the housing, which facilitates manufacturing. According to the invention of claim 3, the valve separation from the retainer is good, and the reduction of the compression effect due to the closing delay of the discharge valve is prevented.

According to the fourth aspect of the present invention, it is possible to prevent impact noise and vibration due to the collision between the discharge valve and the retainer.

[Brief description of drawings]

FIG. 1 is a sectional view showing a compressor of a first embodiment.

2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an enlarged cross-sectional view showing a portion of the discharge valve of FIG.

FIG. 4 is an enlarged cross-sectional view of the discharge valve portion as seen from the outer peripheral side of the housing.

FIG. 5 is a sectional view showing a main part of a compressor according to a second embodiment.

FIG. 6 is a sectional view showing a main part of a compressor according to a third embodiment.

FIG. 7 is an enlarged partial sectional view showing a main part of a compressor of a fourth embodiment.

FIG. 8 is a cross-sectional view showing a main part of a compressor according to another example.

[Explanation of symbols]

11 ... A cylinder block forming a part of the housing,
12 ... Front housing constituting a part of housing, 13 ... Rear housing as housing, 23 ...
Cylinder bore as compression chamber, 36 ... Discharge chamber, 37 ... Discharge port, 38 ... Discharge valve as reed valve, 39 ... Retainer, 40, 51, 56 ... Groove, 41 ... Retainer surface, 4
2 ... ridgeline.

Front page continued (72) Inventor Yoichi Okazuru 2-chome Toyota-cho, Kariya city, Aichi Prefecture Toyota Industries Corporation

Claims (4)

[Claims] 1. A compression chamber for compressing suction gas and a discharge chamber for storing compressed gas discharged from the compression chamber are provided inside the housing, and a predetermined discharge port is provided between the compression chamber and the discharge chamber. A compressor in which a reed valve for discharging compressed gas of a pressure to a discharge chamber is provided, and a retainer for restricting the opening of the reed valve is integrally formed with a housing, wherein the retainer is a parallel extending substantially in a radial direction of the housing. A compressor in which two reed valves are formed so that the opening of the reed valve is regulated by contact with the reed valves. 2. The compressor according to claim 1, wherein a groove extending in a radial direction of the housing is formed on a surface of the retainer, and ridge lines are formed on both side edges of the groove. 3. The compressor according to claim 2, wherein at least one end of the groove is open. 4. The both ends of the groove are closed.
The compressor described in.